7mm. The course of the fasciation on both wings is much as in longipecten,
but the fasciae are more angular, entire, less punctate. Males (slides
12651, 12666) tentatively associated with females (slides 12664, 12669) from
Seram with similar genitalia to the Bornean female have the costal zone of the
forewing strongly modified: it is folded at the edge, but posterior to this
above there is a longitudinal declivity full of longer, beige-coloured scales,
formed from expansion of the zone anterior to the radial stem in the cell and
beyond. The genitalia are similar to those of longipecten, but the comb
of spines is short, central, with eight or so teeth, and there are distinctive
zones of fine crinkling of the bursa wall. The genitalia of the Seram males have
the broad basal part of the valve much shorter than in longipecten, and
the tapering distal part is thus relatively longer.